Life & fun · February 24, 2026
O2 - Breath Hold Trainer
Train your breath holds with science-based apnea tables
What it does
O2 brings professional freediver training to your pocket. Unlike generic breathing apps, it uses real CO₂ and O₂ apnea tables - the same methods used by competitive freedivers to safely extend breath holds Features: • Adaptive training based on your personal best • CO₂ tables (fixed holds, decreasing rest) • O₂ tables (progressive holds, fixed rest) • Box breathing and relaxation exercises • Progress, streaks and stats • HealthKit integration • Safety-first approach with guided warm-ups
Does a similar job
all alternatives →
Breath Training System PRO - CO2, O2Jun 2026 · apps-developer.garmin.com · ▲3Turn your watch into a complete breath training system.
- IMI'm a doctor and made a responsive breathing app for stress and anxiety2023 · lungy.app · ▲666
Hey HN! Some more info: I’m an NHS doctor and the founder of Pi-A (https://www.pi-a.io) which developed Lungy (https://www.lungy.app). Lungy is an app (iOS only for now) that responds to breathing in real-time and was designed to make breathing exercises more engaging and beneficial to do. It hopefully has many aspects of interest to the HN community – real-time fluid, cloth and soft body sims running on the phone’s GPU. My background is as a junior surgical trainee and I started building Lungy in 2020 during the first COVID lockdown in London. During COVID, there were…
- BPBreathe – Peripheral Breath Trainer2020 · github.com · ▲167
More life & fun this month
the category →- TL
Life & fun · 10d ago · louisabraham.github.io
Photosynthesis fires two of your iPhone
Life & fun · 29d ago · photosynthesis.camera
- CCCreatium Coach▲320
Your multimedia mentor that takes you from mid to great
Life & fun · 11d ago · producthunt.creatium.info
SoloUno▲310Take control of hair pulling, nail biting & skin picking
Life & fun · 29d ago · solouno.io
